Keyboard



FIG. 1 is a front perspective view of a keyboard showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is an enlarged front perspective view of the claimed region in FIGS. 1-2, shown in isolation; and,

FIG. 4 is a top view thereof.

The broken line showing of the remainder of the keyboard is for environmental purposes only and forms no part of the claimed design. 

CLAIM The ornamental design for a keyboard, as shown and described. 